3 * $Id: tun-unet.c,v 1.4 2001/02/19 19:10:45 mdw Exp $
5 * Tunnel interface based on Linux Usernet
7 * (c) 2001 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
14 * TrIPE is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * TrIPE is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with TrIPE; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
31 * $Log: tun-unet.c,v $
32 * Revision 1.4 2001/02/19 19:10:45 mdw
33 * Set unet devices to be point-to-point.
35 * Revision 1.3 2001/02/05 19:55:00 mdw
36 * Guard against inappropriate compilation.
38 * Revision 1.2 2001/02/04 17:10:58 mdw
39 * Make file descriptors be nonblocking and close-on-exec.
41 * Revision 1.1 2001/02/03 20:26:37 mdw
46 /*----- Header files ------------------------------------------------------*/
50 #include <sys/ioctl.h>
54 /*----- Main code ---------------------------------------------------------*/
56 #if TUN_TYPE != TUN_UNET
57 # error "Tunnel type mismatch: fix the Makefile"
62 * Arguments: @int fd@ = file descriptor to read
63 * @unsigned mode@ = what's happened
64 * @void *v@ = pointer to tunnel block
68 * Use: Reads data from the tunnel.
71 void t_read(int fd
, unsigned mode
, void *v
)
77 n
= read(fd
, buf_i
, sizeof(buf_i
));
79 a_warn("tunnel read failed (%s): %s", tun_ifname(t
), strerror(errno
));
82 IF_TRACING(T_TUNNEL
, {
83 trace(T_TUNNEL
, "tunnel: packet arrived");
84 trace_block(T_PACKET
, "tunnel: packet contents", buf_i
, n
);
86 buf_init(&b
, buf_i
, n
);
90 /* --- @tun_init@ --- *
96 * Use: Initializes the tunneling system. Maybe this will require
97 * opening file descriptors or something.
105 /* --- @tun_create@ --- *
107 * Arguments: @tunnel *t@ = pointer to tunnel block
108 * @peer *p@ = pointer to peer block
110 * Returns: Zero if it worked, nonzero on failure.
112 * Use: Initializes a new tunnel.
115 int tun_create(tunnel
*t
, peer
*p
)
120 if ((fd
= open("/dev/unet", O_RDWR
)) < 0) {
121 a_warn("open `/dev/unet' failed: %s", strerror(errno
));
124 fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, FD_CLOEXEC
, FD_CLOEXEC
);
125 if ((f
= ioctl(fd
, UNIOCGIFFLAGS
)) < 0 ||
126 ioctl(fd
, UNIOCSIFFLAGS
, f
| IFF_POINTOPOINT
)) {
127 a_warn("couldn't set point-to-point flag: %s", strerror(errno
));
132 sel_initfile(&sel
, &t
->f
, fd
, SEL_READ
, t_read
, t
);
134 T( trace(T_TUNNEL
, "tunnel: attached interface %s to peer `%s'",
135 tun_ifname(t
), p_name(p
)); )
139 /* --- @tun_ifname@ --- *
141 * Arguments: @tunnel *t@ = pointer to tunnel block
143 * Returns: A pointer to the tunnel's interface name.
146 const char *tun_ifname(tunnel
*t
)
148 static char b
[UNET_NAMEMAX
];
149 struct unet_info uni
;
150 if (ioctl(t
->f
.fd
, UNIOCGINFO
, &uni
)) {
151 a_warn("ioctl(UNIOCGINFO) failed: %s", strerror(errno
));
154 if (strlen(uni
.uni_ifname
) + 1 > sizeof(b
)) {
155 a_warn("interface name too long!");
158 strcpy(b
, uni
.uni_ifname
);
162 /* --- @tun_inject@ --- *
164 * Arguments: @tunnel *t@ = pointer to tunnel block
165 * @buf *b@ = buffer to send
169 * Use: Injects a packet into the local network stack.
172 void tun_inject(tunnel
*t
, buf
*b
)
174 IF_TRACING(T_TUNNEL
, {
175 trace(T_TUNNEL
, "tunnel: inject decrypted packet");
176 trace_block(T_PACKET
, "tunnel: packet contents", BBASE(b
), BLEN(b
));
178 write(t
->f
.fd
, BBASE(b
), BLEN(b
));
181 /* --- @tun_destroy@ --- *
183 * Arguments: @tunnel *t@ = pointer to tunnel block
187 * Use: Destroys a tunnel.
190 void tun_destroy(tunnel
*t
)
196 /*----- That's all, folks -------------------------------------------------*/